Touch screen test
Draw across the test area with your finger. Each square turns green when it registers a touch, so areas that never respond stand out. Put several fingers down to see how many touches your screen tracks at once.
Draw over the whole area with your finger until every square is green.
- Touches now
- 0
- Most at once
- 0
- Area covered
- 0%
- Input type
- —
How to test your touch screen
- Press Full screen so the test covers the whole display, including the edges.
- Slowly draw lines across the screen, row by row, until every square is green. Go right to the edges and corners.
- Draw a few long straight lines: a line that breaks or jumps in the same place every time points to a dead or faulty zone.
- Place two, three, then more fingers on the screen and watch Touches now.
- Leave the screen untouched for a while: new marks appearing on their own are ghost touches.
Reading the result
- Squares that stay grey after you draw over them repeatedly: the digitiser does not register touches there.
- Broken lines in the same place: an unreliable strip of the digitiser, common after cracks or pressure damage.
- Most simultaneous touches: phones and tablets typically track several fingers; some laptops and older devices track fewer. The number shows what reaches the browser.
- Marks you did not make: ghost touches, which can be caused by a damaged screen, a poor screen protector, moisture or a faulty charger.
Limits
The page sees touch positions only. It cannot measure pressure sensitivity, response time or the screen's internal calibration. Browser gestures (edge swipes, pull to refresh) may take over at the very edges on some phones; full screen reduces this.
Questions
Why are the edges hard to test?
Phones reserve edge swipes for system navigation. Use full screen, draw slowly from the inside towards the edge, and stop just before the swipe triggers.
Can I test a touch laptop or a monitor with touch?
Yes. Any screen that reports touches to the browser works, including Windows and ChromeOS touch laptops.
Related tests
- Dead pixel testFull-screen colours to find dead, stuck and hot pixels on any screen.
- Uniformity testFull-screen greys to spot clouding, vignetting, banding and dirty screen effect.
- Screen colour testFull-screen solid colours: red, green, blue, yellow, purple, pink and any custom colour.
- White screenA plain white full-screen page for checking, cleaning or lighting.
- Black screenA pure black full-screen page to find bright pixels and backlight bleed.
- Red screenA full-screen red light in four brightness levels, from pure red to very dim.
- Pink screenA full-screen pink light in soft shades, for selfies, video calls and backgrounds.